CN105672450A - Laying method for large-aperture water draining pipeline parallel to upper part of existing metro tunnel structure - Google Patents
Laying method for large-aperture water draining pipeline parallel to upper part of existing metro tunnel structure Download PDFInfo
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- CN105672450A CN105672450A CN201610086577.8A CN201610086577A CN105672450A CN 105672450 A CN105672450 A CN 105672450A CN 201610086577 A CN201610086577 A CN 201610086577A CN 105672450 A CN105672450 A CN 105672450A
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- steel sheet
- tunnel structure
- sheet pile
- laying method
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
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- Life Sciences & Earth Sciences (AREA)
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- Hydrology & Water Resources (AREA)
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Abstract
The invention discloses a laying method for a large-aperture water draining pipeline parallel to the upper part of an existing metro tunnel structure. The method comprises the following steps: step 1, reinforcing the bottom of a groove with a hierarchical grouting process by adopting a mixture of cement and water glass; step 2, performing construction supporting by Larsen steel sheet piles: adopting the Larsen steel sheet piles as supporting piles; step 3, performing excavation and arranging steel supports and steel enclosing purlins, wherein the steel supports are fixedly connected with the Larsen steel sheet piles through section steel; step 4, excavating to the bottom of a foundation pit and ramming a pipeline foundation to be flat; step 5, laying a glass fiber reinforced plastic sand-included large-aperture pipeline on the pipeline foundation, constructing a main body structure, and after the main body structure reaches the design strength, performing backfill from bottom to top until the backfill height reaches a design ground elevation; and step 6, pulling out the Larsen steel sheet piles and filling a gap after pulling out the Larsen steel sheet piles or the steel enclosing purlins. The method is high in construction speed and can ensure that the displacement of the top of each supporting pile in the foundation pit excavation process and the settling volume of surrounding ground are within an acceptable range.
Description
Technical field
The present invention relates to technical field of building construction, particularly relate to and a kind of be parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure.
Background technology
In order to improve the drainage waterlogging prevention ability in city, it is generally required to arrange bigbore drainage pipeline, laying large-caliber drainage pipeline becomes the important measures solving completed region of the city road hydrops. But, in completed region of the city, substantial amounts of subway tunnel structure has been carried out complete, if needing to arrange large-caliber drainage pipeline in drainage system, then can only implement above subway tunnel structure.
At present, be arranged at the large-caliber drainage pipeline above subway tunnel structure and generally adopt reinforced concrete pipiline, the time that in laid processes, foundation ditch opens wide need to meet in concrete reinforced pipe the curing time on basis, large diameter reinforced concrete pipe the lifting time, match concrete manhole formwork erection, build and curing time etc.; The space of excavation of foundation pit need to meet the work surface of armored concrete lifting and the installation requirement of supporting pipe pillow, base plate and bed course. It is said that in general, the time that foundation ditch opens wide is more of a specified duration, the space of excavation is more big, and the soil deformation amount bottom the foundation ditch brought is more big. Owing to the deadweight in large diameter reinforced concrete pipe road is heavier, the specification of required lifting machine equipment is big, and the additional load produced in lower pipe process is also bigger.
Additionally, the drainage pipeline laid at present is also frequently with line slab supporting or channel-section steel steel sheet pile enclosure, owing to the rigidity of the measure of going along with sb. to guard him is less, the surrounding ground sedimentation brought is relatively big, but also to match with on-site groundwater treatment scheme. When closing on structures place and laying drainage pipeline, the rotary churning pile fender post as drainage pipeline foundation ditch of double diameter 800mm is added frequently with the root pile of diameter 400mm, to reduce the impact closing on structures, but the vertical first horizontal support of this fender post need to adopt reinforced concrete fortifield village purlin, fender post and enclose purlin and be required for maintenance, the activity duration is also longer.
But, if adopting the laying of above-mentioned large diameter pipeline repeatedly, for parallel laid large diameter pipeline above existing subway tunnel structure, owing to subway tunnel structure is very sensitive for surrounding environment change, carrying out job execution particularly in tunnel upper can make tunnel structure be subjected to displacement and deform, even more so that tunnel structure cracking seepage. Therefore, the top laying large-caliber drainage pipeline being parallel to existing subway tunnel structure always is and brings great challenge to the design of city outdoor drainage in the forbidden zone of pipeline laying.
Therefore, those skilled in the art need badly and study that a kind of speed of application is fast, can ensure that the displacement on fender post top in Excavation Process and surrounding ground settling amount within the acceptable range be parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure.
Summary of the invention
Because the drawbacks described above of prior art, the invention provides that a kind of speed of application is fast, can ensure that the displacement on fender post top in Excavation Process and surrounding ground settling amount within the acceptable range be parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure.
For achieving the above object, the invention provides and a kind of be parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure, it is characterized in that, comprise the steps: step one, adopt the cement mixture with waterglass, by delamination pour slurry technique, channel bottom is carried out consolidation process; Step 2, construction supporting Larsen steel sheet pile; Adopting Larsen steel sheet pile as fender post, the edge of described Larsen steel sheet pile is provided with elongated waterproof fore shaft; Step 3, excavating and arrange bracing members and steel encloses purlin, described bracing members is fixed with described Larsen steel sheet pile by shaped steel and is connected; Step 4, dig to, at the bottom of foundation ditch, ramming flat pipeline foundation; Step 5, on described pipeline foundation, lay chamber for fibre-reinforced plastics sand inclusion large diameter pipeline, agent structure of constructing, reach, after design strength, to backfill from bottom to top until agent structure, until being backfilled to design ground elevation; Step 6, extracts described Larsen steel sheet pile, and fills described Larsen steel sheet pile or described steel encloses the space after purlin is extracted.
In some preferred implementations, the fresh Portland cement that described cement adopts intensity to be 42.5, described cement is as follows with the component of the mixture of waterglass: grouting volume ratio is more than or equal to 20%, the ratio of mud is 0.5, cement and waterglass volume ratio are 1:1, and modulus of water glass is 3.0～3.3.
In some preferred implementations, in described elongated waterproof fore shaft, it is filled with hermetic seal material.
In some preferred implementations, described hermetic seal material is butter or Colophonium.
In some preferred implementations, described Larsen steel sheet pile adopts screen-type to squeeze into method construction, and adopts the mode of static pressure pile-sinking.
In some preferred implementations, described steel is enclosed and is connected by welding manner between purlin with described bracing members, described Larsen steel sheet pile.
In some preferred implementations, described steel encloses the junction of purlin and described bracing members, described Larsen steel sheet pile and is provided with stiffener.
In some preferred implementations, adopting 25cm gravel sand basis when ramming flat pipeline foundation, 5cm yellow ground lining is flat, and compactness is 90%.
In some preferred implementations, in described step 5 during backfill, after being backfilled to the elevation place of described bracing members, remove bracing members again.
In some preferred implementations, excavation lays a length of tubing every time, adopts the mode gone along with sb. to guard him equally and excavate to lay next length of tubing after having backfilled again.Every length of tubing length is 3m or 4.5m.
In some preferred implementations, in step 6, the cement grout adopting the ratio of mud to be 0.8 fills steel sheet pile or steel encloses the space after purlin is extracted.
Beneficial effects of the present invention:
The above-mentioned paving mode of the present invention, adopt Larsen steel sheet pile as fender post, excavation of foundation pit space decreases about 20%, space occupation of land decreases about 50%, simultaneously because adopt bracing members and steel to enclose purlin, the unlimited time of foundation ditch about decreases 50%, accelerates speed of application, effectively reduces the impact on existing subway tunnel structure.
In the above-mentioned paving mode of the present invention; adopt Larsen steel sheet pile as fender post; the edge of Larsen steel sheet pile is provided with elongated waterproof fore shaft; it is filled with hermetic seal material in elongated waterproof fore shaft; so that be mutually twisted into the continuous retaining wall that can intercept water and mutually pin down between Larsen steel sheet pile; ensure that the rigidity of retaining design and intensity, it is ensured that in Excavation Process, the displacement on fender post top and surrounding ground settling amount are within the acceptable range.
In the above-mentioned paving mode of the present invention, adopt cement and waterglass delamination pour slurry mode that the soil body of channel bottom is reinforced, add the intensity of passive area inside foundation ditch, effectively reduce internal force and the deformation of retaining design, large diameter pipeline is provided reliable base support simultaneously.
Additionally, large diameter pipeline adopts chamber for fibre-reinforced plastics sand inclusion pipe, the deadweight of chamber for fibre-reinforced plastics sand inclusion pipe is relatively light, and required hanging device is less, remains basically stable with general vehicular load, reduces the impact on existing subway tunnel structure.
Excavation lays a length of tubing every time, adopts the mode gone along with sb. to guard him equally and excavate to lay next joint road after having backfilled again.
Every length of tubing length is 3m or 4.5m, it is possible to meet road traffic night block part track construction, daytime open to traffic requirement, reduce single excavation area ensure that the impact on subway tunnel is only small, be controlled.
Below with reference to accompanying drawing, the technique effect of the design of the present invention, concrete structure and generation is described further, to be fully understood from the purpose of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Detailed description of the invention
As described in Figure 1, the present embodiment proposes and a kind of is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure, and the method comprises the steps:
Step one, employing cement and the mixture 2 of waterglass, carry out consolidation process by delamination pour slurry technique to channel bottom. In the mixture of cement and waterglass, adopt the mixed liquor of fresh Portland cement (strength of cement class 4 2.5) and waterglass, cement mixing content and the ratio of mud should determine according to scene test. But the component of mixture should meet following condition simultaneously: grouting volume ratio is more than or equal to 20%, and the ratio of mud is 0.5, cement and waterglass volume ratio are 1:1, and modulus of water glass is 3.0～3.3.
The soil body of channel bottom is reinforced by cement and waterglass mixture delamination pour slurry, adds the intensity of passive area inside foundation ditch, effectively reduces internal force and the deformation of retaining design, large diameter pipeline provides reliable base support simultaneously.
Step 2, construction supporting Larsen steel sheet pile 1. Adopting Larsen steel sheet pile 1 as fender post, Larsen steel sheet pile 1 adopts screen-type to squeeze into method construction. The edge of Larsen steel sheet pile 1 is provided with elongated waterproof fore shaft, is filled with hermetic seal material in elongated waterproof fore shaft.Wherein, hermetic seal material preferably employs as the material such as butter, Colophonium. When specifically applying, adopt standard steel sheet pile as fore shaft reshaping clamping fixture, adopt low speed winch tractive adjustment to process, or knock mold propulsion method with oxy-acetylene flame baking the affected part after applying some drugs in conjunction with sledgehammer and carry out straightening process.
Owing to adopting Larsen steel sheet pile as fender post; the edge of Larsen steel sheet pile is provided with elongated waterproof fore shaft; so that be mutually twisted into the continuous retaining wall that can intercept water and mutually pin down between Larsen steel sheet pile; ensure that the rigidity of retaining design and intensity, it is ensured that in Excavation Process, the displacement on fender post top and surrounding ground settling amount are within the acceptable range.
Step 3, excavate and arrange bracing members and steel encloses purlin. Bracing members is connected by shaped steel is fixing with Larsen steel sheet pile 1. In the present embodiment, shaped steel adopts H type shaped steel 5, and bracing members is the both sides that horizontal support 6, H type shaped steel is arranged at horizontal support 6, and is attached by welding manner.
According to design size, after being excavated to 6 times 0.3m of horizontal support, construction level supports 6. Larsen steel sheet pile 1 and steel enclose purlin and should adopt welding connecting mode, and steel encloses purlin and should fit Larsen steel sheet pile 1, if steel encloses there is gap between purlin and Larsen steel sheet pile 1, then should fill pea gravel concreten in gap and tamp. Steel encloses purlin and bracing members junction and encloses the edge of a wing of purlin and support and web all should be welded with stiffener, and the thickness of stiffener is not less than 10mm. Welding adopts welded corner joint, and the fillet weld size of angle welding cannot be less than 1.5t0.5, and cannot be less than 8mm.
The above-mentioned paving mode of the present invention, adopt Larsen steel sheet pile as fender post, the space of excavation of foundation pit decreases about 20%, space occupation of land decreases about 50%, simultaneously because adopt bracing members and steel to enclose purlin, the unlimited time of foundation ditch about decreases 50%, thus accelerating speed of application, effectively reduces the impact on existing subway tunnel structure.
Step 4, dig to, at the bottom of foundation ditch, ramming flat pipeline foundation 3. Pipeline foundation 3 adopts 25cm gravel sand basis, and 5cm yellow ground lining is flat, and compactness is 90%.
Step 5, on pipeline foundation, lay chamber for fibre-reinforced plastics sand inclusion large diameter pipeline 4, agent structure of constructing, reach, after design strength, to backfill from bottom to top until agent structure, until being backfilled to design ground elevation.
Step 6, extracts Larsen steel sheet pile 1, and the cement grout adopting the ratio of mud to be 0.8 fills Larsen steel sheet pile or steel encloses the space after purlin is extracted. When specifically applying, along full stake depth bounds internal pore compaction grouting.
The preferred embodiment of the present invention described in detail above. Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work. Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. one kind is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure, it is characterised in that comprise the steps:
Step one, employing cement and the mixture of waterglass, carry out consolidation process by delamination pour slurry technique to channel bottom;
Step 2, construction supporting Larsen steel sheet pile; Adopting Larsen steel sheet pile as fender post, the edge of described Larsen steel sheet pile is provided with elongated waterproof fore shaft;
Step 3, excavating and arrange bracing members and steel encloses purlin, described bracing members is fixed with described Larsen steel sheet pile by shaped steel and is connected;
Step 4, dig to, at the bottom of foundation ditch, ramming flat pipeline foundation;
Step 5, on described pipeline foundation, lay chamber for fibre-reinforced plastics sand inclusion large diameter pipeline, agent structure of constructing, reach, after design strength, to backfill from bottom to top until agent structure, until being backfilled to design ground elevation;
Step 6, extracts described Larsen steel sheet pile, and fills described Larsen steel sheet pile or described steel encloses the space after purlin is extracted.
2. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 1, it is characterized in that, the fresh Portland cement that described cement adopts intensity to be 42.5, described cement is as follows with the component of the mixture of waterglass: grouting volume ratio is more than or equal to 20%, the ratio of mud is 0.5, cement and waterglass volume ratio are 1:1, and modulus of water glass is 3.0～3.3.
3. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 2, it is characterised in that in described elongated waterproof fore shaft, be filled with hermetic seal material.
4. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 3, it is characterised in that described hermetic seal material is butter or Colophonium.
5. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 3, it is characterised in that described Larsen steel sheet pile adopts screen-type to squeeze into method construction, and adopts the mode of static pressure pile-sinking.
6. as described in claim 4 or 5, it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure, it is characterised in that described steel is enclosed and is connected by welding manner between purlin with described bracing members, described Larsen steel sheet pile.
7. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 6, it is characterised in that described steel encloses the junction of purlin and described bracing members, described Larsen steel sheet pile and is provided with stiffener.
8. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 7, it is characterised in that adopting 25cm gravel sand basis when ramming flat pipeline foundation, 5cm yellow ground lining is flat, and compactness is 90%.
9. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 8, it is characterised in that in described step 5 during backfill, after being backfilled to the elevation place of described bracing members, remove bracing members again.
10. it is parallel to the laying method of large-caliber drainage pipeline above existing subway tunnel structure as claimed in claim 1, it is characterised in that excavation lays a length of tubing every time, adopts the mode gone along with sb. to guard him equally and excavate to lay next length of tubing after having backfilled again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610086577.8A CN105672450A (en) | 2016-02-16 | 2016-02-16 | Laying method for large-aperture water draining pipeline parallel to upper part of existing metro tunnel structure |
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| CN201610086577.8A CN105672450A (en) | 2016-02-16 | 2016-02-16 | Laying method for large-aperture water draining pipeline parallel to upper part of existing metro tunnel structure |
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Cited By (7)
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| CN106759384A (en) * | 2016-12-24 | 2017-05-31 | 中铁十八局集团有限公司 | A kind of method that use prefabricated pipeline base plate does Brace in Deep Footing Groove |
| CN107191677A (en) * | 2017-06-22 | 2017-09-22 | 中交二公局第五工程有限公司 | A kind of oil-gas pipeline protector and its construction method |
| CN109339063A (en) * | 2018-12-05 | 2019-02-15 | 济南热力集团有限公司 | The guard method and its protection structure that fuel gas conduit is intersected in lower section when thermal pipe is laid with |
| CN109372013A (en) * | 2018-10-25 | 2019-02-22 | 南京吉欧地下空间科技有限公司 | It is a kind of for backfilling the EPS composite soil construction technology and method of pipe gallery on soft foundation |
| CN110396881A (en) * | 2019-07-18 | 2019-11-01 | 湖北建科国际工程有限公司 | The road construction method of section conllinear with rail traffic |
| CN110468938A (en) * | 2019-07-02 | 2019-11-19 | 北京质诚捷讯水利工程有限公司 | A kind of municipal drain pipeline construction method |
| CN112064751A (en) * | 2020-08-08 | 2020-12-11 | 上海静安市政工程有限公司 | Deep groove construction method for drainage pipeline |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759384A (en) * | 2016-12-24 | 2017-05-31 | 中铁十八局集团有限公司 | A kind of method that use prefabricated pipeline base plate does Brace in Deep Footing Groove |
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| CN109372013A (en) * | 2018-10-25 | 2019-02-22 | 南京吉欧地下空间科技有限公司 | It is a kind of for backfilling the EPS composite soil construction technology and method of pipe gallery on soft foundation |
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| CN109339063A (en) * | 2018-12-05 | 2019-02-15 | 济南热力集团有限公司 | The guard method and its protection structure that fuel gas conduit is intersected in lower section when thermal pipe is laid with |
| CN110468938A (en) * | 2019-07-02 | 2019-11-19 | 北京质诚捷讯水利工程有限公司 | A kind of municipal drain pipeline construction method |
| CN110396881A (en) * | 2019-07-18 | 2019-11-01 | 湖北建科国际工程有限公司 | The road construction method of section conllinear with rail traffic |
| CN112064751A (en) * | 2020-08-08 | 2020-12-11 | 上海静安市政工程有限公司 | Deep groove construction method for drainage pipeline |
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Application publication date: 20160615 |